A thin polycristalline film of $\alpha$-glycine, which had been previously ground and exposed to air-humidity for some days, shows strong changes in the i.r. spectrum if it is compressed between two KBr discs. By the analogy between this i.r. spectrum and that of $\gamma$-glycine, it has been supposed a crystalline transformation of $\alpha$-glycine towards the $\gamma$ form which is caused by a pressure effect and by a surface effect of KBr discs. An explanation of the phenomenon is to refer to the different types of hydrogen bonding which characterise the two polymorphic forms of the glycine.
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